[jira] [Created] (MESOS-3518) Assertions that compare doubles with == can fail due to rounding issues and can crash the master.

["Max Neunhöffer (JIRA)" <ji...@apache.org>]

Max Neunhöffer created MESOS-3518:
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             Summary: Assertions that compare doubles with == can fail due to rounding issues and can crash the master.
                 Key: MESOS-3518
                 URL: https://issues.apache.org/jira/browse/MESOS-3518
             Project: Mesos
          Issue Type: Bug
          Components: master
    Affects Versions: 0.24.1, 0.24.0, 0.23.1, 0.23.0
            Reporter: Max Neunhöffer
            Priority: Minor


mesos-0.23.0/src/common/resources.cpp has
  CHECK(result.cpus() == cpus() &&
        result.mem() == mem() &&
        result.disk() == disk() &&
        result.ports() == ports());
at around line 869. Sometimes, rounding errors can trigger this check to fail because of the cpus() part. One should take the absolute value of the difference and compare with a small value to avoid this problem. The same problem could be true in various places, so far I have not yet checked.
Seems to be present in all versions I checked. I could trigger this by asking for some resource value of cpus(*):0.2



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